OFDM Relay Cognitive Radio Multiple Antennas Synchronization Channel Estimation Resource Allocation Full duplex CDMA Spectrum Sharing Spectrum Sensing Interference Cancellation Stochastic Geometry Bi-Directional Neural Networks Feedback Heterogeneous Networks Energy Harvesting Equalizer FBMC Femtocell Equalization Device-to-Device (D2D) in-band full-duplex system relay networks HetNet C-V2V Reliability interference suppression non-orthogonal multiple access LTE-based V2V channel capacity Handoff SC-FDMA Cell Search mode selection Spectral efficiency Channel estimation error TVWS Ultra-dense small cell networks Idle cells Ultra Low Power GFDM SINR mismatch problem 5G Duplex interference Vehicle-to-vehicle communication MIMO Ultra-dense small cell mMTC Power control Spatial capacity End-to-end delay Poisson arrival Communication range ultra-dense small cell network Traffic user fairness inter user interference Number of training blocks CFO SCMA self interference cancellation timing misalignment User association Outdated channel estimation Full-duplex Short burst transmission MPA detector Time-division duplex Waveforms OCBT Uplink SCMA system Capacity resource block management WVAN 5G mobile communication frame structure UFMC resource selection health care body area networks QAM —Dynamic TDD; cross-link interference; HetNet; LTE-TDD maximum likelihood method Zigbee distributed mode antenna arrays amplify and forward communication FS-NOMA quality of service cellular radio telecommunication traffic Multi-user Receiver Metaheuristics intersymbol interference intercarrier interference power uncertainty QR Factorization Mode 3